Im trying to find some clarification of xen-2.0.7 use of smp machines, the output from ''xm dmesg'' shows cpus0 and cpu1, and the FAQ says why dom0 doesnt show the second cpu, how do i know that my single domU is bound to cpu1 ? __________________________________________________ www.palen.serveftp.net Center for Advanced Computing http://cac.engin.umich.edu brockp@umich.edu _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sat, 2005-10-01 at 12:58 -0400, Brock Palen wrote:> Im trying to find some clarification of xen-2.0.7 use of smp machines, > the output from ''xm dmesg'' shows cpus0 and cpu1, and the FAQ says why dom0 > doesnt show the second cpu, how do i know that my single domU is bound to cpu1 > ? > __________________________________________________ > www.palen.serveftp.net > Center for Advanced Computing > http://cac.engin.umich.edu > brockp@umich.edu2.0.7 does not support SMP domU''s. Regards, Ted _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sat, 1 Oct 2005, Ted Kaczmarek wrote:> > On Sat, 2005-10-01 at 12:58 -0400, Brock Palen wrote: > > Im trying to find some clarification of xen-2.0.7 use of smp machines, > > the output from ''xm dmesg'' shows cpus0 and cpu1, and the FAQ says why dom0 > > doesnt show the second cpu, how do i know that my single domU is bound to cpu1 > > ? > > 2.0.7 does not support SMP domU''s.That wasn''t his question. xm list will show which domains are running on which CPUs. Unfortunately, if you have hyperthreading enabled, you need to know which cpus map to which threads on which cores... otherwise you can easily have two doms running on opposite threads on the same core, and the other core being idle :( [in fact that is the default] I don''t have the official CPU numbering in my head, but I believe a dual CPU system with hyperthreading enabled will have cpu''s 0 and 1 on the two threads of the first core, and 2 and 3 on the threads of the second core... so if you only have dom0 and one domU running, you would want to xm pincpu domUname 2 or put cpu=2 into the config file for the domU -Tom _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Quoting Tom Brown <tbrown@baremetal.com>:> On Sat, 1 Oct 2005, Ted Kaczmarek wrote: > >> >> On Sat, 2005-10-01 at 12:58 -0400, Brock Palen wrote: >> > Im trying to find some clarification of xen-2.0.7 use of smp machines, >> > the output from ''xm dmesg'' shows cpus0 and cpu1, and the FAQ says >> why dom0 >> > doesnt show the second cpu, how do i know that my single domU is >> bound to cpu1 >> > ? >> >> 2.0.7 does not support SMP domU''s. > > That wasn''t his question. > > xm list will show which domains are running on which CPUs. Unfortunately, > if you have hyperthreading enabled, you need to know which cpus map to > which threads on which cores... otherwise you can easily have two doms > running on opposite threads on the same core, and the other core being > idle :( [in fact that is the default] > > I don''t have the official CPU numbering in my head, but I believe a dual > CPU system with hyperthreading enabled will have cpu''s 0 and 1 on the two > threads of the first core, and 2 and 3 on the threads of the second > core... so if you only have dom0 and one domU running, you would want to >I have from xm list Name Id Mem(MB) CPU State Time(s) Console Domain-0 0 123 0 r---- 7543.7 mls 1 499 1 -b--- 4764.2 9601 Its a duel P3 so no hyperthreading, and xm info shoes only 1 hypterthread per cpu, and 2 cores, so domain mls (domU) is using the second cpu, thats great thankyou!> xm pincpu domUname 2 > > or put cpu=2 into the config file for the domU > > -Tom > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users